Curve25519 Option Missing

Curve25519 option is missing, looked in forms & bug reports for "Curve25519", but not seeing anyone reporting, or asking about this, so here goes:

$ gpg2 --expert --full-gen-key
gpg (GnuPG) 2.1.11; Copyright (C) 2016 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Please select what kind of key you want:
   (1) RSA and RSA (default)
   (2) DSA and Elgamal
   (3) DSA (sign only)
   (4) RSA (sign only)
   (7) DSA (set your own capabilities)
   (8) RSA (set your own capabilities)
   (9) ECC and ECC
  (10) ECC (sign only)
  (11) ECC (set your own capabilities)
Your selection? 9
Please select which elliptic curve you want:
   (2) NIST P-256
   (3) NIST P-384
   (4) NIST P-521
   (5) Brainpool P-256
   (6) Brainpool P-384
   (7) Brainpool P-512
Your selection? 1
Invalid selection.
Your selection?

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So as you see, the elliptic curve options start numbering with 2). But option 1) should be Curve25519

What's going on here?

Running a fully-updated Xubuntu 16.04.1 LTS
...including gpg (GnuPG) 2.1.11 & libgcrypt 1.6.5